; flat assembler core
; Copyright (c) 1999-2006, Tomasz Grysztar.
; All rights reserved.
assembler:
xor eax,eax
mov [stub_size],eax
mov [number_of_sections],eax
mov [current_pass],ax
mov [resolver_flags],eax
assembler_loop:
mov eax,[labels_list]
mov [display_buffer],eax
mov eax,[additional_memory]
mov [free_additional_memory],eax
mov eax,[additional_memory_end]
mov [structures_buffer],eax
mov esi,[source_start]
mov edi,[code_start]
xor eax,eax
mov dword [adjustment],eax
mov dword [adjustment+4],eax
mov dword [org_origin],edi
mov dword [org_origin+4],eax
mov [org_start],edi
mov [org_registers],eax
mov [org_symbol],eax
mov [error_line],eax
mov [counter],eax
mov [format_flags],eax
mov [number_of_relocations],eax
mov [undefined_data_end],eax
mov [next_pass_needed],al
mov [output_format],al
mov [labels_type],al
mov [virtual_data],al
mov [code_type],16
pass_loop:
call assemble_line
jnc pass_loop
mov eax,[additional_memory_end]
cmp eax,[structures_buffer]
je pass_done
sub eax,20h
mov eax,[eax+4]
mov [current_line],eax
jmp missing_end_directive
pass_done:
call close_pass
mov eax,[labels_list]
check_symbols:
cmp eax,[memory_end]
jae symbols_checked
test byte [eax+8],8
jz symbol_defined_ok
mov cx,[current_pass]
cmp cx,[eax+18]
jne symbol_defined_ok
test byte [eax+8],1
jz symbol_defined_ok
sub cx,[eax+16]
cmp cx,1
jne symbol_defined_ok
and byte [eax+8],not 1
or [next_pass_needed],-1
symbol_defined_ok:
test byte [eax+8],10h
jz use_prediction_ok
mov cx,[current_pass]
and byte [eax+8],not 10h
test byte [eax+8],20h
jnz check_use_prediction
cmp cx,[eax+18]
jne use_prediction_ok
test byte [eax+8],8
jz use_prediction_ok
jmp use_misprediction
check_use_prediction:
test byte [eax+8],8
jz use_misprediction
cmp cx,[eax+18]
je use_prediction_ok
use_misprediction:
or [next_pass_needed],-1
use_prediction_ok:
test byte [eax+8],40h
jz check_next_symbol
and byte [eax+8],not 40h
test byte [eax+8],4
jnz define_misprediction
mov cx,[current_pass]
test byte [eax+8],80h
jnz check_define_prediction
cmp cx,[eax+16]
jne check_next_symbol
test byte [eax+8],1
jz check_next_symbol
jmp define_misprediction
check_define_prediction:
test byte [eax+8],1
jz define_misprediction
cmp cx,[eax+16]
je check_next_symbol
define_misprediction:
or [next_pass_needed],-1
check_next_symbol:
add eax,LABEL_STRUCTURE_SIZE
jmp check_symbols
symbols_checked:
cmp [next_pass_needed],0
jne next_pass
mov eax,[error_line]
or eax,eax
jz assemble_ok
mov [current_line],eax
jmp near [error]
next_pass:
inc [current_pass]
mov ax,[current_pass]
cmp ax,[passes_limit]
je code_cannot_be_generated
jmp assembler_loop
assemble_ok:
ret
assemble_line:
mov eax,[display_buffer]
sub eax,100h
cmp edi,eax
ja out_of_memory
lods byte [esi]
cmp al,1
je assemble_instruction
jb source_end
cmp al,3
jb define_label
je define_constant
cmp al,0Fh
je new_line
cmp al,13h
je code_type_setting
cmp al,10h
jne illegal_instruction
lods byte [esi]
jmp segment_prefix
code_type_setting:
lods byte [esi]
mov [code_type],al
jmp line_assembled
new_line:
lods dword [esi]
mov [current_line],eax
mov [prefixed_instruction],0
continue_line:
cmp byte [esi],0Fh
je line_assembled
jmp assemble_line
define_label:
lods dword [esi]
cmp eax,0Fh
jb invalid_use_of_symbol
je reserved_word_used_as_symbol
mov ebx,eax
lods byte [esi]
mov cl,al
mov eax,edi
xor edx,edx
sub eax,dword [org_origin]
sbb edx,dword [org_origin+4]
mov ch,[labels_type]
cmp [virtual_data],0
jne make_virtual_label
or byte [ebx+9],1
xchg eax,[ebx]
xchg edx,[ebx+4]
sub eax,[ebx]
sbb edx,[ebx+4]
mov dword [adjustment],eax
mov dword [adjustment+4],edx
or eax,edx
setnz ah
jmp finish_label_symbol
make_virtual_label:
and byte [ebx+9],not 1
cmp eax,[ebx]
mov [ebx],eax
setne ah
cmp edx,[ebx+4]
mov [ebx+4],edx
setne al
or ah,al
finish_label_symbol:
cmp cl,[ebx+10]
mov [ebx+10],cl
setne al
or ah,al
cmp ch,[ebx+11]
mov [ebx+11],ch
setne al
or ah,al
mov edx,[org_registers]
cmp edx,[ebx+12]
mov [ebx+12],edx
setne al
or ah,al
or ch,ch
jz label_symbol_ok
mov edx,[org_symbol]
cmp edx,[ebx+20]
mov [ebx+20],edx
setne al
or ah,al
label_symbol_ok:
mov cx,[current_pass]
xchg [ebx+16],cx
mov edx,[current_line]
mov [ebx+28],edx
and byte [ebx+8],not 2
test byte [ebx+8],1
jz new_label
cmp cx,[ebx+16]
je symbol_already_defined
inc cx
sub cx,[ebx+16]
setnz al
or ah,al
jz continue_line
test byte [ebx+8],8
jz continue_line
mov cx,[current_pass]
cmp cx,[ebx+18]
jne continue_line
or [next_pass_needed],-1
jmp continue_line
new_label:
or byte [ebx+8],1
jmp continue_line
define_constant:
lods dword [esi]
inc esi
cmp eax,0Fh
jb invalid_use_of_symbol
je reserved_word_used_as_symbol
mov edx,[eax+8]
push edx
cmp [current_pass],0
je get_constant_value
test dl,4
jnz get_constant_value
mov cx,[current_pass]
cmp cx,[eax+16]
je get_constant_value
and dl,not 1
mov [eax+8],dl
get_constant_value:
push eax
mov al,byte [esi-1]
push eax
call get_value
pop ebx
mov ch,bl
pop ebx
pop dword [ebx+8]
cmp ebx,0Fh
jb invalid_use_of_symbol
je reserved_word_used_as_symbol
xor cl,cl
mov ch,[value_type]
cmp ch,3
je invalid_use_of_symbol
make_constant:
and byte [ebx+9],not 1
cmp eax,[ebx]
mov [ebx],eax
setne ah
cmp edx,[ebx+4]
mov [ebx+4],edx
setne al
or ah,al
cmp cl,[ebx+10]
mov [ebx+10],cl
setne al
or ah,al
cmp ch,[ebx+11]
mov [ebx+11],ch
setne al
or ah,al
xor edx,edx
cmp edx,[ebx+12]
mov [ebx+12],edx
setne al
or ah,al
or ch,ch
jz constant_symbol_ok
mov edx,[symbol_identifier]
cmp edx,[ebx+20]
mov [ebx+20],edx
setne al
or ah,al
constant_symbol_ok:
mov cx,[current_pass]
xchg [ebx+16],cx
mov edx,[current_line]
mov [ebx+28],edx
test byte [ebx+8],1
jz new_constant
cmp cx,[ebx+16]
jne redeclare_constant
test byte [ebx+8],2
jz symbol_already_defined
or byte [ebx+8],4
jmp instruction_assembled
redeclare_constant:
inc cx
sub cx,[ebx+16]
setnz al
or ah,al
jz instruction_assembled
test byte [ebx+8],4
jnz instruction_assembled
test byte [ebx+8],8
jz instruction_assembled
mov cx,[current_pass]
cmp cx,[ebx+18]
jne instruction_assembled
or [next_pass_needed],-1
jmp instruction_assembled
new_constant:
or byte [ebx+8],1+2
jmp instruction_assembled
assemble_instruction:
mov [operand_size],0
mov [size_override],0
mov [operand_prefix],0
mov [rex_prefix],0
mov [immediate_size],0
movzx ebx,word [esi]
mov al,[esi+2]
add ebx,assembler
add esi,3
jmp near ebx
instruction_assembled:
mov al,[esi]
cmp al,0Fh
je line_assembled
or al,al
jnz extra_characters_on_line
line_assembled:
clc
ret
source_end:
dec esi
stc
ret
skip_line:
call skip_symbol
jnc skip_line
ret
skip_symbol:
lods byte [esi]
or al,al
jz nothing_to_skip
cmp al,0Fh
je nothing_to_skip
cmp al,1
je skip_instruction
cmp al,2
je skip_label
cmp al,3
je skip_label
cmp al,20h
jb skip_assembler_symbol
cmp al,'('
je skip_expression
cmp al,'['
je skip_address
skip_done:
clc
ret
skip_label:
add esi,2
skip_instruction:
add esi,2
skip_assembler_symbol:
inc esi
jmp skip_done
skip_address:
mov al,[esi]
and al,11110000b
cmp al,60h
jb skip_expression
cmp al,70h
ja skip_expression
inc esi
jmp skip_address
skip_expression:
lods byte [esi]
or al,al
jz skip_string
cmp al,'.'
je skip_fp_value
cmp al,')'
je skip_done
cmp al,']'
je skip_done
cmp al,'!'
je skip_expression
cmp al,0Fh
je skip_expression
cmp al,10h
je skip_register
cmp al,11h
je skip_label_value
cmp al,80h
jae skip_expression
movzx eax,al
add esi,eax
jmp skip_expression
skip_label_value:
add esi,3
skip_register:
inc esi
jmp skip_expression
skip_fp_value:
add esi,12
jmp skip_done
skip_string:
lods dword [esi]
add esi,eax
inc esi
jmp skip_done
nothing_to_skip:
dec esi
stc
ret
org_directive:
lods byte [esi]
cmp al,'('
jne invalid_argument
cmp byte [esi],'.'
je invalid_value
call get_qword_value
mov cl,[value_type]
test cl,1
jnz invalid_use_of_symbol
mov [labels_type],cl
mov ecx,edi
sub ecx,eax
adc edx,0
neg edx
mov dword [org_origin],ecx
mov dword [org_origin+4],edx
mov [org_registers],0
mov [org_start],edi
mov edx,[symbol_identifier]
mov [org_symbol],edx
cmp [output_format],1
ja instruction_assembled
cmp edi,[code_start]
jne instruction_assembled
cmp eax,100h
jne instruction_assembled
bts [format_flags],0
jmp instruction_assembled
label_directive:
lods byte [esi]
cmp al,2
jne invalid_argument
lods dword [esi]
cmp eax,0Fh
jb invalid_use_of_symbol
je reserved_word_used_as_symbol
inc esi
mov ebx,eax
xor cl,cl
lods byte [esi]
cmp al,':'
je get_label_size
dec esi
cmp al,11h
jne label_size_ok
get_label_size:
lods word [esi]
cmp al,11h
jne invalid_argument
mov cl,ah
label_size_ok:
mov eax,edi
xor edx,edx
sub eax,dword [org_origin]
sbb edx,dword [org_origin+4]
mov ebp,[org_registers]
cmp byte [esi],80h
je get_free_label_value
mov ch,[labels_type]
push [org_symbol]
pop [address_symbol]
cmp [virtual_data],0
jne make_free_label
or byte [ebx+9],1
xchg eax,[ebx]
xchg edx,[ebx+4]
sub eax,[ebx]
sbb edx,[ebx+4]
mov dword [adjustment],eax
mov dword [adjustment+4],edx
or eax,edx
setne ah
jmp finish_label
get_free_label_value:
inc esi
lods byte [esi]
cmp al,'('
jne invalid_argument
push dword [ebx+8]
push ebx ecx
and byte [ebx+8],not 1
cmp byte [esi],'.'
je invalid_value
call get_address_value
or bh,bh
setnz ch
xchg ch,cl
mov bp,cx
shl ebp,16
xchg bl,bh
mov bp,bx
pop ecx ebx
pop dword [ebx+8]
mov ch,[value_type]
or ch,ch
jz make_free_label
cmp ch,4
je make_free_label
cmp ch,2
jne invalid_use_of_symbol
make_free_label:
and byte [ebx+9],not 1
cmp eax,[ebx]
mov [ebx],eax
setne ah
cmp edx,[ebx+4]
mov [ebx+4],edx
setne al
or ah,al
jmp finish_label
finish_label:
cmp cl,[ebx+10]
mov [ebx+10],cl
setne al
or ah,al
cmp ch,[ebx+11]
mov [ebx+11],ch
setne al
or ah,al
cmp ebp,[ebx+12]
mov [ebx+12],ebp
setne al
or ah,al
or ch,ch
jz free_label_symbol_ok
mov edx,[address_symbol]
cmp edx,[ebx+20]
mov [ebx+20],edx
setne al
or ah,al
free_label_symbol_ok:
mov cx,[current_pass]
xchg [ebx+16],cx
mov edx,[current_line]
mov [ebx+28],edx
and byte [ebx+8],not 2
test byte [ebx+8],1
jz new_free_label
cmp cx,[ebx+16]
je symbol_already_defined
inc cx
sub cx,[ebx+16]
setnz al
or ah,al
jz instruction_assembled
test byte [ebx+8],8
jz instruction_assembled
mov cx,[current_pass]
cmp cx,[ebx+18]
jne instruction_assembled
or [next_pass_needed],-1
jmp instruction_assembled
new_free_label:
or byte [ebx+8],1
jmp instruction_assembled
load_directive:
lods byte [esi]
cmp al,2
jne invalid_argument
lods dword [esi]
cmp eax,0Fh
jb invalid_use_of_symbol
je reserved_word_used_as_symbol
inc esi
push eax
mov al,1
cmp byte [esi],11h
jne load_size_ok
lods byte [esi]
lods byte [esi]
load_size_ok:
cmp al,8
ja invalid_value
mov [operand_size],al
mov dword [value],0
mov dword [value+4],0
lods word [esi]
cmp ax,82h+'(' shl 8
jne invalid_argument
load_from_code:
cmp byte [esi],'.'
je invalid_value
call get_address_value
call calculate_relative_offset
push esi edi
cmp [next_pass_needed],0
jne load_address_type_ok
cmp [value_type],0
jne invalid_use_of_symbol
load_address_type_ok:
cmp edx,-1
jne bad_load_address
neg eax
mov esi,edi
sub esi,eax
jc bad_load_address
cmp esi,[org_start]
jb bad_load_address
mov edi,value
movzx ecx,[operand_size]
cmp ecx,eax
ja bad_load_address
rep movs byte [edi],[esi]
jmp value_loaded
bad_load_address:
cmp [error_line],0
jne value_loaded
mov eax,[current_line]
mov [error_line],eax
mov [error],value_out_of_range
value_loaded:
pop edi esi
mov eax,dword [value]
mov edx,dword [value+4]
pop ebx
xor cx,cx
jmp make_constant
store_directive:
cmp byte [esi],11h
je sized_store
lods byte [esi]
cmp al,'('
jne invalid_argument
call get_byte_value
xor edx,edx
movzx eax,al
mov [operand_size],1
jmp store_value_ok
sized_store:
call get_value
store_value_ok:
cmp [value_type],0
jne invalid_use_of_symbol
mov dword [value],eax
mov dword [value+4],edx
lods word [esi]
cmp ax,80h+'(' shl 8
jne invalid_argument
cmp byte [esi],'.'
je invalid_value
call get_address_value
call calculate_relative_offset
push esi edi
cmp [next_pass_needed],0
jne store_address_type_ok
cmp [value_type],0
jne invalid_use_of_symbol
store_address_type_ok:
cmp edx,-1
jne bad_store_address
neg eax
sub edi,eax
jc bad_store_address
cmp edi,[org_start]
jb bad_store_address
mov esi,value
movzx ecx,[operand_size]
cmp ecx,eax
ja bad_store_address
rep movs byte [edi],[esi]
mov eax,edi
pop edi esi
cmp edi,[undefined_data_end]
jne instruction_assembled
cmp eax,[undefined_data_start]
jbe instruction_assembled
mov [undefined_data_start],eax
jmp instruction_assembled
bad_store_address:
pop edi esi
cmp [error_line],0
jne instruction_assembled
mov eax,[current_line]
mov [error_line],eax
mov [error],value_out_of_range
jmp instruction_assembled
display_directive:
lods byte [esi]
cmp al,'('
jne invalid_argument
cmp byte [esi],0
jne display_byte
inc esi
lods dword [esi]
mov ecx,eax
push edi
mov edi,[display_buffer]
sub edi,4
sub edi,eax
mov [display_buffer],edi
rep movs byte [edi],[esi]
stos dword [edi]
pop edi
inc esi
jmp display_next
display_byte:
call get_byte_value
push edi
mov edi,[display_buffer]
sub edi,4+1
mov [display_buffer],edi
stos byte [edi]
mov eax,1
stos dword [edi]
pop edi
display_next:
cmp edi,[display_buffer]
ja out_of_memory
lods byte [esi]
cmp al,','
je display_directive
dec esi
jmp instruction_assembled
flush_display_buffer:
mov eax,[display_buffer]
or eax,eax
jz display_done
mov esi,[labels_list]
cmp esi,eax
je display_done
display_messages:
sub esi,4
mov ecx,[esi]
sub esi,ecx
push esi
call display_block
pop esi
cmp esi,[display_buffer]
jne display_messages
mov eax,[labels_list]
mov [display_buffer],eax
display_done:
ret
times_directive:
lods byte [esi]
cmp al,'('
jne invalid_argument
cmp byte [esi],'.'
je invalid_value
call get_dword_value
cmp [next_pass_needed],0
jne times_value_ok
cmp [value_type],0
jne invalid_use_of_symbol
times_value_ok:
cmp eax,0
je zero_times
jl negative_times
cmp byte [esi],':'
jne times_argument_ok
inc esi
times_argument_ok:
push [counter]
push [counter_limit]
mov [counter_limit],eax
mov [counter],1
times_loop:
mov eax,esp
sub eax,100h
jc stack_overflow
cmp eax,[stack_limit]
jb stack_overflow
push esi
or [prefixed_instruction],-1
call continue_line
mov eax,[counter_limit]
cmp [counter],eax
je times_done
inc [counter]
pop esi
jmp times_loop
times_done:
pop eax
pop [counter_limit]
pop [counter]
jmp instruction_assembled
negative_times:
cmp [error_line],0
jne zero_times
mov eax,[current_line]
mov [error_line],eax
mov [error],invalid_value
zero_times:
call skip_line
jmp instruction_assembled
virtual_directive:
lods byte [esi]
cmp al,80h
jne virtual_at_current
lods byte [esi]
cmp al,'('
jne invalid_argument
cmp byte [esi],'.'
je invalid_value
call get_address_value
mov ebp,[address_symbol]
xor ch,ch
or bh,bh
jz set_virtual
mov ch,1
jmp set_virtual
virtual_at_current:
dec esi
mov al,[labels_type]
mov [value_type],al
mov ebp,[org_symbol]
mov eax,edi
xor edx,edx
sub eax,dword [org_origin]
sbb edx,dword [org_origin+4]
mov bx,word [org_registers]
mov cx,word [org_registers+2]
xchg bh,bl
xchg ch,cl
set_virtual:
push [org_registers]
mov byte [org_registers],bh
mov byte [org_registers+1],bl
mov byte [org_registers+2],ch
mov byte [org_registers+3],cl
call allocate_structure_data
mov word [ebx],virtual_directive-assembler
not eax
not edx
add eax,1
adc edx,0
add eax,edi
adc edx,0
xchg dword [org_origin],eax
xchg dword [org_origin+4],edx
mov [ebx+10h],eax
mov [ebx+14h],edx
pop eax
mov [ebx+18h],eax
mov al,[virtual_data]
mov [ebx+2],al
mov al,[labels_type]
mov [ebx+3],al
mov eax,edi
xchg eax,[org_start]
mov [ebx+0Ch],eax
xchg ebp,[org_symbol]
mov [ebx+1Ch],ebp
mov [ebx+8],edi
mov eax,[current_line]
mov [ebx+4],eax
or [virtual_data],-1
mov al,[value_type]
test al,1
jnz invalid_use_of_symbol
mov [labels_type],al
jmp instruction_assembled
allocate_structure_data:
mov ebx,[structures_buffer]
sub ebx,20h
cmp ebx,[free_additional_memory]
jb out_of_memory
mov [structures_buffer],ebx
ret
find_structure_data:
mov ebx,[structures_buffer]
scan_structures:
cmp ebx,[additional_memory_end]
je no_such_structure
cmp ax,[ebx]
je structure_data_found
add ebx,20h
jmp scan_structures
structure_data_found:
ret
no_such_structure:
stc
ret
end_virtual:
call find_structure_data
jc unexpected_instruction
mov al,[ebx+2]
mov [virtual_data],al
mov al,[ebx+3]
mov [labels_type],al
mov eax,[ebx+10h]
mov dword [org_origin],eax
mov eax,[ebx+14h]
mov dword [org_origin+4],eax
mov eax,[ebx+18h]
mov [org_registers],eax
mov eax,[ebx+0Ch]
mov [org_start],eax
mov eax,[ebx+1Ch]
mov [org_symbol],eax
mov edi,[ebx+8]
remove_structure_data:
push esi edi
mov esi,[structures_buffer]
mov ecx,ebx
sub ecx,esi
lea edi,[esi+20h]
mov [structures_buffer],edi
shr ecx,2
rep movs dword [edi],[esi]
pop edi esi
ret
repeat_directive:
cmp [prefixed_instruction],0
jne unexpected_instruction
lods byte [esi]
cmp al,'('
jne invalid_argument
cmp byte [esi],'.'
je invalid_value
call get_dword_value
cmp [next_pass_needed],0
jne repeat_value_ok
cmp [value_type],0
jne invalid_use_of_symbol
repeat_value_ok:
cmp eax,0
je zero_repeat
jl negative_repeat
call allocate_structure_data
mov word [ebx],repeat_directive-assembler
xchg eax,[counter_limit]
mov [ebx+10h],eax
mov eax,1
xchg eax,[counter]
mov [ebx+14h],eax
mov [ebx+8],esi
mov eax,[current_line]
mov [ebx+4],eax
jmp instruction_assembled
end_repeat:
cmp [prefixed_instruction],0
jne unexpected_instruction
call find_structure_data
jc unexpected_instruction
mov eax,[counter_limit]
inc [counter]
cmp [counter],eax
jbe continue_repeating
stop_repeat:
mov eax,[ebx+10h]
mov [counter_limit],eax
mov eax,[ebx+14h]
mov [counter],eax
call remove_structure_data
jmp instruction_assembled
continue_repeating:
mov esi,[ebx+8]
jmp instruction_assembled
negative_repeat:
cmp [error_line],0
jne zero_repeat
mov eax,[current_line]
mov [error_line],eax
mov [error],invalid_value
zero_repeat:
mov al,[esi]
or al,al
jz missing_end_directive
cmp al,0Fh
jne extra_characters_on_line
call find_end_repeat
jmp instruction_assembled
find_end_repeat:
call find_structure_end
cmp ax,repeat_directive-assembler
jne unexpected_instruction
ret
while_directive:
cmp [prefixed_instruction],0
jne unexpected_instruction
call allocate_structure_data
mov word [ebx],while_directive-assembler
mov eax,1
xchg eax,[counter]
mov [ebx+10h],eax
mov [ebx+8],esi
mov eax,[current_line]
mov [ebx+4],eax
do_while:
push ebx
call calculate_logical_expression
or al,al
jnz while_true
mov al,[esi]
or al,al
jz missing_end_directive
cmp al,0Fh
jne extra_characters_on_line
stop_while:
call find_end_while
pop ebx
mov eax,[ebx+10h]
mov [counter],eax
call remove_structure_data
jmp instruction_assembled
while_true:
pop ebx
jmp instruction_assembled
end_while:
cmp [prefixed_instruction],0
jne unexpected_instruction
call find_structure_data
jc unexpected_instruction
mov eax,[ebx+4]
mov [current_line],eax
inc [counter]
jz too_many_repeats
mov esi,[ebx+8]
jmp do_while
find_end_while:
call find_structure_end
cmp ax,while_directive-assembler
jne unexpected_instruction
ret
if_directive:
cmp [prefixed_instruction],0
jne unexpected_instruction
call calculate_logical_expression
mov dl,al
mov al,[esi]
or al,al
jz missing_end_directive
cmp al,0Fh
jne extra_characters_on_line
or dl,dl
jnz if_true
call find_else
jc instruction_assembled
mov al,[esi]
cmp al,1
jne else_true
cmp word [esi+1],if_directive-assembler
jne else_true
add esi,4
jmp if_directive
if_true:
xor al,al
make_if_structure:
call allocate_structure_data
mov word [ebx],if_directive-assembler
mov byte [ebx+2],al
mov eax,[current_line]
mov [ebx+4],eax
jmp instruction_assembled
else_true:
or al,al
jz missing_end_directive
cmp al,0Fh
jne extra_characters_on_line
or al,-1
jmp make_if_structure
else_directive:
cmp [prefixed_instruction],0
jne unexpected_instruction
mov ax,if_directive-assembler
call find_structure_data
jc unexpected_instruction
cmp byte [ebx+2],0
jne unexpected_instruction
found_else:
mov al,[esi]
cmp al,1
jne skip_else
cmp word [esi+1],if_directive-assembler
jne skip_else
add esi,4
call find_else
jnc found_else
call remove_structure_data
jmp instruction_assembled
skip_else:
or al,al
jz missing_end_directive
cmp al,0Fh
jne extra_characters_on_line
call find_end_if
call remove_structure_data
jmp instruction_assembled
end_if:
cmp [prefixed_instruction],0
jne unexpected_instruction
call find_structure_data
jc unexpected_instruction
call remove_structure_data
jmp instruction_assembled
find_else:
call find_structure_end
cmp ax,else_directive-assembler
je else_found
cmp ax,if_directive-assembler
jne unexpected_instruction
stc
ret
else_found:
clc
ret
find_end_if:
call find_structure_end
cmp ax,if_directive-assembler
jne unexpected_instruction
ret
find_structure_end:
push [error_line]
mov eax,[current_line]
mov [error_line],eax
find_end_directive:
call skip_line
lods byte [esi]
cmp al,0Fh
jne no_end_directive
lods dword [esi]
mov [current_line],eax
skip_labels:
cmp byte [esi],2
jne labels_ok
add esi,6
jmp skip_labels
labels_ok:
cmp byte [esi],1
jne find_end_directive
mov ax,[esi+1]
cmp ax,prefix_instruction-assembler
je find_end_directive
add esi,4
cmp ax,repeat_directive-assembler
je skip_repeat
cmp ax,while_directive-assembler
je skip_while
cmp ax,if_directive-assembler
je skip_if
cmp ax,else_directive-assembler
je structure_end
cmp ax,end_directive-assembler
jne find_end_directive
cmp byte [esi],1
jne find_end_directive
mov ax,[esi+1]
add esi,4
cmp ax,repeat_directive-assembler
je structure_end
cmp ax,while_directive-assembler
je structure_end
cmp ax,if_directive-assembler
jne find_end_directive
structure_end:
pop [error_line]
ret
no_end_directive:
mov eax,[error_line]
mov [current_line],eax
jmp missing_end_directive
skip_repeat:
call find_end_repeat
jmp find_end_directive
skip_while:
call find_end_while
jmp find_end_directive
skip_if:
call skip_if_block
jmp find_end_directive
skip_if_block:
call find_else
jc if_block_skipped
cmp byte [esi],1
jne skip_after_else
cmp word [esi+1],if_directive-assembler
jne skip_after_else
add esi,4
jmp skip_if_block
skip_after_else:
call find_end_if
if_block_skipped:
ret
end_directive:
lods byte [esi]
cmp al,1
jne invalid_argument
lods word [esi]
inc esi
cmp ax,virtual_directive-assembler
je end_virtual
cmp ax,repeat_directive-assembler
je end_repeat
cmp ax,while_directive-assembler
je end_while
cmp ax,if_directive-assembler
je end_if
cmp ax,data_directive-assembler
je end_data
jmp invalid_argument
break_directive:
mov ebx,[structures_buffer]
mov al,[esi]
or al,al
jz find_breakable_structure
cmp al,0Fh
jne extra_characters_on_line
find_breakable_structure:
cmp ebx,[additional_memory_end]
je unexpected_instruction
mov ax,[ebx]
cmp ax,repeat_directive-assembler
je break_repeat
cmp ax,while_directive-assembler
je break_while
cmp ax,if_directive-assembler
je break_if
add ebx,20h
jmp find_breakable_structure
break_if:
push [current_line]
mov eax,[ebx+4]
mov [current_line],eax
call remove_structure_data
call skip_if_block
pop [current_line]
mov ebx,[structures_buffer]
jmp find_breakable_structure
break_repeat:
push ebx
call find_end_repeat
pop ebx
jmp stop_repeat
break_while:
push ebx
jmp stop_while
data_bytes:
call define_data
lods byte [esi]
cmp al,'('
je get_byte
cmp al,'?'
jne invalid_argument
mov eax,edi
mov byte [edi],0
inc edi
jmp undefined_data
get_byte:
cmp byte [esi],0
je get_string
call get_byte_value
stos byte [edi]
ret
get_string:
inc esi
lods dword [esi]
mov ecx,eax
lea eax,[edi+ecx]
cmp eax,[display_buffer]
ja out_of_memory
rep movs byte [edi],[esi]
inc esi
ret
undefined_data:
cmp [virtual_data],0
je mark_undefined_data
ret
mark_undefined_data:
cmp eax,[undefined_data_end]
je undefined_data_ok
mov [undefined_data_start],eax
undefined_data_ok:
mov [undefined_data_end],edi
ret
define_data:
cmp edi,[display_buffer]
jae out_of_memory
cmp byte [esi],'('
jne simple_data_value
mov ebx,esi
inc esi
call skip_expression
xchg esi,ebx
cmp byte [ebx],81h
jne simple_data_value
inc esi
call get_dword_value
cmp [next_pass_needed],0
jne dup_value_ok
cmp [value_type],0
jne invalid_use_of_symbol
dup_value_ok:
inc esi
cmp eax,0
jg dup_positive
cmp [error_line],0
jne dup_invalid
mov eax,[current_line]
mov [error_line],eax
mov [error],invalid_value
dup_invalid:
mov eax,1
dup_positive:
cmp byte [esi],'{'
jne duplicate_single_data_value
inc esi
duplicate_data:
push eax esi
duplicated_values:
cmp edi,[display_buffer]
jae out_of_memory
call near dword [esp+8]
lods byte [esi]
cmp al,','
je duplicated_values
cmp al,'}'
jne invalid_argument
pop ebx eax
dec eax
jz data_defined
mov esi,ebx
jmp duplicate_data
duplicate_single_data_value:
cmp edi,[display_buffer]
jae out_of_memory
push eax esi
call near dword [esp+8]
pop ebx eax
dec eax
jz data_defined
mov esi,ebx
jmp duplicate_single_data_value
simple_data_value:
cmp edi,[display_buffer]
jae out_of_memory
call near dword [esp]
data_defined:
lods byte [esi]
cmp al,','
je define_data
dec esi
add esp,4
jmp instruction_assembled
data_unicode:
or [base_code],-1
jmp define_words
data_words:
mov [base_code],0
define_words:
call define_data
lods byte [esi]
cmp al,'('
je get_word
cmp al,'?'
jne invalid_argument
mov eax,edi
mov word [edi],0
scas word [edi]
jmp undefined_data
ret
get_word:
cmp [base_code],0
je word_data_value
cmp byte [esi],0
je word_string
word_data_value:
call get_word_value
call mark_relocation
stos word [edi]
ret
word_string:
inc esi
lods dword [esi]
mov ecx,eax
jecxz word_string_ok
lea eax,[edi+ecx*2]
cmp eax,[display_buffer]
ja out_of_memory
xor ah,ah
copy_word_string:
lods byte [esi]
stos word [edi]
loop copy_word_string
word_string_ok:
inc esi
ret
data_dwords:
call define_data
lods byte [esi]
cmp al,'('
je get_dword
cmp al,'?'
jne invalid_argument
mov eax,edi
mov dword [edi],0
scas dword [edi]
jmp undefined_data
get_dword:
push esi
call get_dword_value
pop ebx
cmp byte [esi],':'
je complex_dword
call mark_relocation
stos dword [edi]
ret
complex_dword:
mov esi,ebx
cmp byte [esi],'.'
je invalid_value
call get_word_value
push eax
inc esi
lods byte [esi]
cmp al,'('
jne invalid_operand
mov al,[value_type]
push eax
cmp byte [esi],'.'
je invalid_value
call get_word_value
call mark_relocation
stos word [edi]
pop eax
mov [value_type],al
pop eax
call mark_relocation
stos word [edi]
ret
data_pwords:
call define_data
lods byte [esi]
cmp al,'('
je get_pword
cmp al,'?'
jne invalid_argument
mov eax,edi
mov dword [edi],0
scas dword [edi]
mov word [edi],0
scas word [edi]
jmp undefined_data
get_pword:
push esi
call get_pword_value
pop ebx
cmp byte [esi],':'
je complex_pword
call mark_relocation
stos dword [edi]
mov ax,dx
stos word [edi]
ret
complex_pword:
mov esi,ebx
cmp byte [esi],'.'
je invalid_value
call get_word_value
push eax
inc esi
lods byte [esi]
cmp al,'('
jne invalid_operand
mov al,[value_type]
push eax
cmp byte [esi],'.'
je invalid_value
call get_dword_value
call mark_relocation
stos dword [edi]
pop eax
mov [value_type],al
pop eax
call mark_relocation
stos word [edi]
ret
data_qwords:
call define_data
lods byte [esi]
cmp al,'('
je get_qword
cmp al,'?'
jne invalid_argument
mov eax,edi
mov dword [edi],0
scas dword [edi]
mov dword [edi],0
scas dword [edi]
jmp undefined_data
get_qword:
call get_qword_value
call mark_relocation
stos dword [edi]
mov eax,edx
stos dword [edi]
ret
data_twords:
call define_data
lods byte [esi]
cmp al,'('
je get_tword
cmp al,'?'
jne invalid_argument
mov eax,edi
mov dword [edi],0
scas dword [edi]
mov dword [edi],0
scas dword [edi]
mov word [edi],0
scas word [edi]
jmp undefined_data
get_tword:
cmp byte [esi],'.'
jne complex_tword
inc esi
cmp word [esi+8],8000h
je fp_zero_tword
mov eax,[esi]
stos dword [edi]
mov eax,[esi+4]
stos dword [edi]
mov ax,[esi+8]
add ax,3FFFh
cmp ax,8000h
jae value_out_of_range
mov bl,[esi+11]
shl bx,15
or ax,bx
stos word [edi]
add esi,13
ret
fp_zero_tword:
xor eax,eax
stos dword [edi]
stos dword [edi]
mov al,[esi+11]
shl ax,15
stos word [edi]
add esi,13
ret
complex_tword:
call get_word_value
push eax
inc esi
lods byte [esi]
cmp al,'('
jne invalid_operand
mov al,[value_type]
push eax
cmp byte [esi],'.'
je invalid_value
call get_qword_value
call mark_relocation
stos dword [edi]
mov eax,edx
stos dword [edi]
pop eax
mov [value_type],al
pop eax
call mark_relocation
stos word [edi]
ret
data_file:
lods word [esi]
cmp ax,'('
jne invalid_argument
add esi,4
call open_binary_file
mov eax,[esi-4]
lea esi,[esi+eax+1]
mov al,2
xor edx,edx
call lseek
push eax
xor edx,edx
cmp byte [esi],':'
jne position_ok
inc esi
cmp byte [esi],'('
jne invalid_argument
inc esi
cmp byte [esi],'.'
je invalid_value
push ebx
call get_dword_value
pop ebx
mov edx,eax
sub [esp],edx
position_ok:
cmp byte [esi],','
jne size_ok
inc esi
cmp byte [esi],'('
jne invalid_argument
inc esi
cmp byte [esi],'.'
je invalid_value
push ebx edx
call get_dword_value
pop edx ebx
mov [esp],eax
size_ok:
xor al,al
call lseek
pop ecx
mov edx,edi
add edi,ecx
jc out_of_memory
cmp edi,[display_buffer]
ja out_of_memory
call read
jc error_reading_file
call close
lods byte [esi]
cmp al,','
je data_file
dec esi
jmp instruction_assembled
open_binary_file:
push esi
push edi
mov esi,[current_line]
mov esi,[esi]
get_current_path:
lodsb
stosb
or al,al
jnz get_current_path
cut_current_path:
cmp edi,[esp]
je current_path_ok
cmp byte [edi-1],'\'
je current_path_ok
cmp byte [edi-1],'/'
je current_path_ok
dec edi
jmp cut_current_path
current_path_ok:
mov esi,[esp+4]
call preprocess_path
pop edx
mov esi,edx
call open
jnc file_opened
mov edi,esi
mov esi,[esp]
push edi
call preprocess_path
pop edx
mov esi,edx
call open
jc file_not_found
file_opened:
mov edi,esi
pop esi
ret
reserve_bytes:
lods byte [esi]
cmp al,'('
jne invalid_argument
cmp byte [esi],'.'
je invalid_value
call get_dword_value
cmp [next_pass_needed],0
jne rb_value_ok
cmp [value_type],0
jne invalid_use_of_symbol
rb_value_ok:
cmp eax,0
jl reserve_negative
mov ecx,eax
mov edx,ecx
add edx,edi
jc out_of_memory
cmp edx,[display_buffer]
ja out_of_memory
push edi
cmp [next_pass_needed],0
je zero_bytes
add edi,ecx
jmp reserved_data
zero_bytes:
xor eax,eax
shr ecx,1
jnc bytes_stosb_ok
stos byte [edi]
bytes_stosb_ok:
shr ecx,1
jnc bytes_stosw_ok
stos word [edi]
bytes_stosw_ok:
rep stos dword [edi]
reserved_data:
pop eax
call undefined_data
jmp instruction_assembled
reserve_negative:
cmp [error_line],0
jne instruction_assembled
mov eax,[current_line]
mov [error_line],eax
mov [error],invalid_value
jmp instruction_assembled
reserve_words:
lods byte [esi]
cmp al,'('
jne invalid_argument
cmp byte [esi],'.'
je invalid_value
call get_dword_value
cmp [next_pass_needed],0
jne rw_value_ok
cmp [value_type],0
jne invalid_use_of_symbol
rw_value_ok:
cmp eax,0
jl reserve_negative
mov ecx,eax
mov edx,ecx
shl edx,1
jc out_of_memory
add edx,edi
jc out_of_memory
cmp edx,[display_buffer]
ja out_of_memory
push edi
cmp [next_pass_needed],0
je zero_words
lea edi,[edi+ecx*2]
jmp reserved_data
zero_words:
xor eax,eax
shr ecx,1
jnc words_stosw_ok
stos word [edi]
words_stosw_ok:
rep stos dword [edi]
jmp reserved_data
reserve_dwords:
lods byte [esi]
cmp al,'('
jne invalid_argument
cmp byte [esi],'.'
je invalid_value
call get_dword_value
cmp [next_pass_needed],0
jne rd_value_ok
cmp [value_type],0
jne invalid_use_of_symbol
rd_value_ok:
cmp eax,0
jl reserve_negative
mov ecx,eax
mov edx,ecx
shl edx,1
jc out_of_memory
shl edx,1
jc out_of_memory
add edx,edi
jc out_of_memory
cmp edx,[display_buffer]
ja out_of_memory
push edi
cmp [next_pass_needed],0
je zero_dwords
lea edi,[edi+ecx*4]
jmp reserved_data
zero_dwords:
xor eax,eax
rep stos dword [edi]
jmp reserved_data
reserve_pwords:
lods byte [esi]
cmp al,'('
jne invalid_argument
cmp byte [esi],'.'
je invalid_value
call get_dword_value
cmp [next_pass_needed],0
jne rp_value_ok
cmp [value_type],0
jne invalid_use_of_symbol
rp_value_ok:
cmp eax,0
jl reserve_negative
mov ecx,eax
shl ecx,1
jc out_of_memory
add ecx,eax
mov edx,ecx
shl edx,1
jc out_of_memory
add edx,edi
jc out_of_memory
cmp edx,[display_buffer]
ja out_of_memory
push edi
cmp [next_pass_needed],0
je zero_words
lea edi,[edi+ecx*2]
jmp reserved_data
reserve_qwords:
lods byte [esi]
cmp al,'('
jne invalid_argument
cmp byte [esi],'.'
je invalid_value
call get_dword_value
cmp [next_pass_needed],0
jne rq_value_ok
cmp [value_type],0
jne invalid_use_of_symbol
rq_value_ok:
cmp eax,0
jl reserve_negative
mov ecx,eax
shl ecx,1
jc out_of_memory
mov edx,ecx
shl edx,1
jc out_of_memory
shl edx,1
jc out_of_memory
add edx,edi
jc out_of_memory
cmp edx,[display_buffer]
ja out_of_memory
push edi
cmp [next_pass_needed],0
je zero_dwords
lea edi,[edi+ecx*4]
jmp reserved_data
reserve_twords:
lods byte [esi]
cmp al,'('
jne invalid_argument
cmp byte [esi],'.'
je invalid_value
call get_dword_value
cmp [next_pass_needed],0
jne rt_value_ok
cmp [value_type],0
jne invalid_use_of_symbol
rt_value_ok:
cmp eax,0
jl reserve_negative
mov ecx,eax
shl ecx,2
jc out_of_memory
add ecx,eax
mov edx,ecx
shl edx,1
jc out_of_memory
add edx,edi
jc out_of_memory
cmp edx,[display_buffer]
ja out_of_memory
push edi
cmp [next_pass_needed],0
je zero_words
lea edi,[edi+ecx*2]
jmp reserved_data
align_directive:
lods byte [esi]
cmp al,'('
jne invalid_argument
cmp byte [esi],'.'
je invalid_value
call get_dword_value
cmp [value_type],0
jne invalid_use_of_symbol
mov edx,eax
dec edx
test eax,edx
jnz negative_times
or eax,eax
jz negative_times
cmp eax,1
je instruction_assembled
mov ecx,edi
sub ecx,dword [org_origin]
cmp [org_registers],0
jne section_not_aligned_enough
cmp [labels_type],0
je make_alignment
cmp [output_format],3
je pe_alignment
mov ebx,[org_symbol]
cmp byte [ebx],0
jne section_not_aligned_enough
cmp eax,[ebx+10h]
jbe make_alignment
jmp section_not_aligned_enough
pe_alignment:
cmp eax,1000h
ja section_not_aligned_enough
make_alignment:
dec eax
and ecx,eax
jz instruction_assembled
neg ecx
add ecx,eax
inc ecx
mov edx,ecx
add edx,edi
jc out_of_memory
cmp edx,[display_buffer]
ja out_of_memory
push edi
cmp [next_pass_needed],0
je nops
add edi,ecx
jmp reserved_data
nops:
mov eax,90909090h
shr ecx,1
jnc nops_stosb_ok
stos byte [edi]
nops_stosb_ok:
shr ecx,1
jnc nops_stosw_ok
stos word [edi]
nops_stosw_ok:
rep stos dword [edi]
jmp reserved_data